The research objective of this study is to determine whether an intervention and associated robotic device called "Assisted Movement with Enhanced Sensation (AMES) can be used to enhance balance recovery following an unexpected loss of balance by conditioning areas of the brain involved in lower-limb (LL) motor control. It is hypothesized that AMES can improve balance recovery, gait, and reduce falls in near-frail elderly people by improving LL strength, speed, and coordination.